I got one of these - a Fenix TK11 - for Christmas. I am loving it! It is replacing my Surefire Z2; it is brighter on the "low" setting, and MUCH brighter on the high setting. Combined with the LED durability and the ability to use a rechargeable battery, and my Surefire has become my backup light, and my large Maglight is now my back-up-back-up light.